Question

What is the 3rd newton law?

Answer 1

for each action,there is an equal and opposite reaction

Answer 2

Newton's third law of motion states that "Every action have an equal and opposite reaction".

This can be understood by an example :-
When you hit your hand against a wall (action) , the wall exerts an equal and opposite force on your hands(reaction) which gives you pain.

HOPE THIS HELPS!